A Converter Certificate That Does Nothing for an Uncertified Mill
A converter's chain of custody certificate cannot retroactively grant certified status to packaging made from uncertified paper mill substrate.
EN 12497
Extractable Determination
This analytical method quantifies the primary aromatic amines present within paper and board materials intended for contact with food products. The en 12497 protocol requires an initial aqueous extraction of the sample under controlled conditions of temperature and duration. Analysts then process the resulting liquid phase through solid phase extraction to concentrate the target analytes.
High performance liquid chromatography linked to a mass spectrometer detects the specific amine compounds at trace levels. Calibration curves established against certified reference standards verify the accuracy of the final quantitative result. Laboratories apply this measurement to ensure that migration limits remain within the safety thresholds defined by food contact regulations.
Material Migration
Compliance with the en 12497 standard provides a verified proof of safety for packaging manufacturers producing dyed cellulose structures or paper using specific precursors. Mills verify the chemical stability of their wet end additives and dyeing processes by measuring the potential release of amines into a food simulant. Production managers hold the responsibility of selecting raw inputs that avoid the presence of banned azo dyes or secondary amines prone to degradation.
A conversion facility monitors the concentration of these substances to detect potential cross contamination occurring during secondary processes like lamination or flexographic printing. Higher migration levels indicate a failure in the purification of the pulp or an incorrect chemical reaction during the paper manufacturing phase. Effective control at the source prevents the transfer of harmful chemicals from the packaging substrate into the contained food supply.
Analytical Constraint
Precise application of en 12497 relies on the accurate simulation of the interface between the paper substrate and the intended food contact environment. Variations in ph levels or temperature during the extraction phase alter the rate of amine release and introduce potential errors in the final data output. Testing procedures must account for the specific composition of the board to distinguish between naturally occurring amines and those introduced by synthetic colorants.
Constant technical oversight ensures that the analytical result represents the true potential for chemical transfer. The standard establishes a rigorous baseline for assessing the suitability of materials that appear safe but contain hidden chemical risks.